Chyba:
H2SO4 %2B Mg3%28PO4%292 %3D H3PO4 %2B Mg%28HSO4%292
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Neočakávaný ('%')H2SO4 %2B Mg3%28PO4%292 %3D H3PO4 %2B Mg%28HSO4%292
^
Neočakávaný ('%')